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how do you simplify this expression?

(7n-n-8n4) + (5n+4n3+5n4)

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Philip P. | Effective and Affordable Math TutorEffective and Affordable Math Tutor
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(7n-n-8n4)+(5n+4n3+5n4)
 
Since all of the operations are addition and subtraction, we can remove the parentheses:
 
7n - n - 8n4 + 5n + 4n3 + 5n4
 
Now combine like-terms. Like terms have the same variable and exponent.  I'll group the like terms in parentheses so you can see them:
 
(-8n4 + 5n4) + (4n3) + (7n - n +5n)
 
-3n4 + 4n3 + 11n